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Recognizing alpha-, beta- or gamma-substitution in pyridines by mass spectrometry

机译:通过质谱识别吡啶中的α,β或γ取代

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摘要

A general mass spectrometric method able to recognize the site of substitution of monosubstituted pyridines is described. The method requires that the molecule under investigation forms, upon ionization and dissociation, the respective alpha-, beta- or gamma-pyridinium ion of m/z 78. Pyridinium ions are stable and common fragments of ionized and protonated pyridines and are found to function as appropriate structurally diagnostic fragment ions. They can be identified by their characteristic and nearly identical collision-induced dissociation behavior and distinguished by the combined use of two structurally diagnostic ion/molecule reactions with acetonitrile and 2-methyl-1,3-dioxolane. alpha-, beta- or gamma-substitution in pyridines can, therefore, be securely recognized via an MS-only method based on structurally diagnostic ions and by the inspection of a single molecule (no need for intracomparisons within the whole set of isomers).
机译:描述了一种能够识别单取代吡啶的取代位点的通用质谱方法。该方法要求所研究的分子在电离和解离后形成m / z 78的相应α-,β-或γ-吡啶鎓离子。吡啶鎓离子是稳定的,是离子化和质子化吡啶的常见片段,被发现具有功能根据需要在结构上诊断碎片离子。它们可以通过其特征和几乎相同的碰撞诱导解离行为进行鉴定,并可以通过将两种结构诊断性离子/分子反应与乙腈和2-甲基-1,3-二氧戊环进行组合使用来区分。因此,可以通过基于结构诊断离子的纯MS方法和单个分子的检查,可靠地识别吡啶中的α,β或γ取代(无需在整个异构体中进行内部比较)。

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